These Fluval ammonia filter pack replacements for the Fluval C4 Aquarium Filter remove and prevent the build up of toxic ammonia in your aquarium. Fluval ammonia filters help your aquatic pets thrive better, as lowering ammonia levels reduces the stress of fish and other aquatic pets. They are especially useful for setting up a new aquarium or in maintaining healthy ammonia levels in heavily populated aquariums.

Fluval C4 ammonia packs gradually become inactive and should be replaced as needed to better maintain water quality. These Fluval ammonia replacement filter packs are also known by Hagen part number 14016. They are for freshwater aquariums only.